So - I really don't want this to be an argument forum, I know it's not for everyone - just want some tips on how to make the effect happen. After seeing the cost, and reading some of the negative feedback about haunted enterprises, I'd like to try to make it myself - any insight on where to begin would be fantastic. Thanks!

So - I really don't want this to be an argument forum, I know it's not for everyone - just want some tips on how to make the effect happen. After seeing the cost, and reading some of the negative feedback about haunted enterprises, I'd like to try to make it myself - any insight on where to begin would be fantastic. Thanks!

And for the uninitiated, could you be a little more detailed or thorough in your explanation of what you are looking for?

I have this exact setup from haunted enterprises. It consists of the following

1 airtank
Maestro 2 prop controller
Doorbell trigger
Sprinkler valve

Basically it is just a air cannon but it also has a sprinkler valve that shoots water when it is triggered. It pulls water from a holding tank. I have not had any issues with haunted enterprises. Really for the cost they sell it for your not saving much.

Just buy it. If you have a way to improve the design then do so and make it yourself. Or rip them off but mail them $20 for giving you the idea. Ideas are worth $20, its the trial and error to make them happen that gets expensive. If you are willing to pay for the trial and error then go ahead and mail them $20.
Allen H